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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f834d2b76e4c72800fc839a049e926f1696468f6ce93379bd4e1a0d3d6dd760' 
  AND token = 'tf30k3CTrjVU5+QroDnwqyaJKvV95oweKz99a+0fdgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}